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Jet
Jet

Howlite
Howlite



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Jet
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Howlite

Jet and Howlite Physical Properties

Jet
Jet
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
1.19-1.35
ConchoidalWalter Schumann
None
2.5-4
C
 
-
-
-
2.45-2.58
Conchoidal
None
3-3.5
Ca 2B 5SiO 9(OH) 5Michael O’Donoghue , Gems, Sixth Edition (2006) More from other references

Jet and Howlite Chemical Formula

While comparing Jet and Howlite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Jet and Howlite chemical formula.

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Jet and Howlite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Jet and Howlite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Jet Vs Howlite during the identification of gemstone. Specific gravity of Jet is whereas that of Howlite is .